I have an 06 660 grizzly that I recently put an aftermarket exhaust and mid pipe on. Now when the idle is low enough that it doesn't jerk when you go in gear it has a flat spot in the throttle. If you push the throttle easy it will stall. You can pin the throttle and it is fine. If you keep the idle turned up just a little too high it is fine as well except for the jerk when it goes in gear. Anyone have any sugestions?